Differential spatial multiplexing

TitleDifferential spatial multiplexing
Publication TypeJournal Article
Year of Publication2006
AuthorsCheung, S. K., and R. Schober
JournalWireless Communications, IEEE Transactions on
Pagination2127 -2135
Date Publishedaug.
Keywordsantenna arrays, channel state information, computational complexity, correlation matrices, decision-feedback differential detection, differential space-time architecture, differential spatial multiplexing, eigendecomposition, eigenvalues and eigenfunctions, group interference suppression, interference suppression, linear decoding complexity, matrix algebra, multiple transmit antennas, multiplexing, receiver, recursive filter optimization, recursive filters, signal detection, space-time codes, transmitting antennas

In this paper, we present a novel differential space-time (DST) architecture which is well suited for high data-rate applications but requires only a linear decoding complexity. Multiple transmit antennas are divided into groups and DST encoding is applied individually to each group. Instead of using the optimum joint-group decoding approach, the proposed receiver combines group interference suppression (GIS) and decision-feedback differential detection (DF-DD) to reduce the decoding complexity. By taking advantage of the differential encoding at the transmitter, the GIS filters can be calculated without explicit knowledge of channel state information. Since the optimization of the GIS filters requires a generalized eigendecomposition of two correlation matrices, we also devise efficient adaptive algorithms for recursive filter optimization. It is shown that both the GIS filter computation and the detection scheme are robust against carrier phase variations


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